1、The water quality tester can be used in swimming pools, drinking water, hydroponics, brewing, etc. 2、Put the temperature electrode and the conductivity electrode into the liquid to be measured and stir gently. After the number is stable, read the final value. 3、The pH probe can be used to directly measure the medium. Simple to operate. 4、There are other functions, automatic shutdown function, low battery indicator. 5、Made of high‑quality plastic material, durable in use and has a long service life. 1 x Salinity / Thermometer (Battery Not Included)3 x Accessory1 x Instructions Condition: 100% Brand NewItem Type: Water Quality TesterMaterial: PlasticProduct Size: Approx. 16.5 x 7.5 x 5cm / 6.5 x 3 x 2inWeight: Approx. 408g / 14.4ozApplication: Salinity / ThermometerMeasuring Range: Temperature: 0-100℃ EC LOW                               EC: 0-1999μs / cm (HI), 0- 19.99ms / cmResolution: Temperature: 0.1℃                    EC: 1μs / cm (height), 0.01ms / cmAccuracy: Temperature: ± 0.5℃                 EC: ±2%FSPower Supply: DC 9V Battery (Not Included)Battery Model: 6F22Temperature Compensation: 0-60℃Working Temperature: 0-60℃Steps: 1. Remove the protective cover and insert the EC electrode and temperature electrode into the corresponding electrode sockets. 2. Wash the electrode with distilled water and dry it with filter paper. 3. Turn on by the ''ON‑OFF'' switch. 4. Put the temperature electrode and conductivity electrode into the liquid to be measured and stir gently. After the number is stable, read the final value. 5. Press ''EC / TEMP'' to select EC or TEMP, press ''ms / us'' to select ms or us. 6. After use, wash the electrode and put on a protective cover.EC Calibration: 1. Press ''EC/TEMP'' to select EC, press ''ms / us'' to select ''ms / cm'' mode, then immerse the conductivity electrode in the 12.88ms / cm standard buffer solution and shake it gently. 2. After the displayed value is stable, adjust with ''ms / cm'' as the bottom until the displayed value is 12.88ms / cm. Wash the electrode with distilled water and dry it with filter paper. 3. Immerse the device in the 1413us/cm ( 1.41EC) standard solution and press ''ms/us'' to select the ''us/cm'' mode. When the displayed value is stable, use ''us / cm'' as the bottom until 1413us / cm is displayed.